Note 1 - Summary of Significant Accounting Policies -Schedule of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Outstanding, shares (in shares)		452,700
Outstanding, weighted average exercise price per share (in dollars per share)		$ 5.97
Granted, shares (in shares)	3,000	54,000	90,000
Granted, weighted average exercise price per share (in dollars per share)		$ 9.63
Exercised, shares (in shares)		(38,244)
Exercised, weighted average exercise price per share (in dollars per share)		$ 4.09
Cancelled, shares (in shares)		(43,956)
Cancelled, weighted average exercise price per share (in dollars per share)		$ 7.50
Outstanding, shares (in shares)		424,500
Outstanding, weighted average exercise price per share (in dollars per share)		$ 6.45
Outstanding, weighted average remaining contractual term (Year)		6 years 5 months 23 days
Outstanding, aggregate intrinsic value		$ 1,375
Exercisable , shares (in shares)		242,800
Exercisable, weighted average exercise price per share (in dollars per share)		$ 4.44
Exercisable, weighted average remaining contractual term (Year)		5 years 1 month 28 days
Exercisable, aggregate intrinsic value		$ 1,197